Electrical phonograph reproducer



Aug. 21, 1928; 1,681,897 c. F. GOUDY v ELECTRICAL PHONOGRAPH REPRODUCER Filed July 30, 1927 iS-Sheets-Sheet l IN V EN TOR.

Eel/1 & 5% M ATTORNEY Aug. 21, 1928. 1,681,897

C. F. GOUDY ELECTRICAL PHONOGRAPH REPRODUCER Filed July 30, 1927 3 Sheets-Sheet 2 INVENTOR.

Gig w 5 ATTORNEY Aug. 21, 1928. 1,681,897

C. F. GOUDY ELECTRICAL PHONOGRAPH REPRODUCER Filed July 30, 1927 3 Sheets-Sheet 5 Wm: WM 71 INVENTOR. 65 1/0062 50% Patented Aug. 21, 1928.

UNITED STATES PATENT OFFICE.

CARL I. GOUDY, OF FLUSHING, NEW YORK, ASSIGNOR TO PACENT RADIO CORPORA- TION, OF NEW YORK, N. Y., A. CORPORATION OF DELAWARE.

ELECTRICAL PHONOGRAPH REPRODUCER.

Application filed July 30,

The objects of this invention are to provide simple and practical apparatus for combining the effects of an ordinary phonograph and a radio receiving set to secure the enhanced efiects of electric phonographic reproduction; to obtain a superior reproductionof this nature and to supply the apparatus for the purpose in a relatively inexpensive form readily applicable to present day phonographs and radio receiving equipment.

The foregoing and other desirable objects are attained by certain novel features of construction, combination and relation of parts, including in particular, an especially efi'ective electromagnetic pick-up for substitution in place of the reproducer of the phonograph, an adapter plug insertible in the detector socket of the radio set to carry the vibrations of the pick-up to the amplifying side of the receiver and a volume control connected with the plug to regulate the output.

The drawings accompanying and forming part of this specification illustrate certain practical embodiments and uses of the in- 2 vention, it being understood that such'illustration is primarily for purposes of disclosure and that the actual structure and application of the invention may vary without departure from the true scope of the invention as hereinafter described and broadly claimed.

Figure 1 is a broken part sectional general view of the-invention as applied to the phonograph and radio receiving set.

Figure2 is a vertical sectional view of the pick-up unit.

Figure 3 is a rear view of this unit.

Figure 4 is a side view of the magnet system of the unit.

Figure 5 is an end view of the magnet sys tem.

Figure 6 is an enlarged sectional view as on substantially the plane of line 66" of Figure 5, showing particularly the elastic mounting of the reed or armature.

Figure 7 is a broken front view illustrating a modification of the unit, adapting it to a record of the hill and dale style of cut.

Figure 8 is a broken side view of this construction.

The phonograph which is partly shown in Figure 1 is of the well known construction, including a swinging tone arm 10 and a turn table 11 carrying the. record 12. Similarly, the radio receiving set is of the usual form having a detector socket 13 and one or more 1927. Serial No. 209,500.

stages 14 of audio-frequency amplification I connected with a speaker 15.

The pick up unit is indicated generally at 16 and 1s of a form to be readily applied to the tone arm in place of the usual sound box. In the illustration this attachment is effected by means of a spring strap or loop 17 connected with the casing of the unit and adapted to be tightened about the neck of the tone arm by a clamp screw 18.

The magnetic system of the unit is shown as consisting of a single short but powerful permanent horseshoe magnet 19 having U- shaped laminated pole pieces 20,.21 secured in opposition on the legs of the magnet and enclosing between them a magnet coil 22 through which passes the vibrating reed or armature 23 carrying or attached at its lower end to the phonograph needle 24.

A flexible and resilient mounting for the reed 1s provided in the illustration by squarmg the lower portion ofthe reed at 25 and surrounding this squared portion with an elastic sleeve 26 of rubber or the like, clamped firmly in the space between the opposing squared ends 27 28 of the pole pieces and the underlying and overlying nonmagnetic blocks or bars 29, 30. These clamp bars 29, 30 are secured together with the intervening portions of the pole pieces and elastically encased shank of the reed therebetween by through bolts 31 and'the upper bar 30 is rigidly secured to the polar tips of the magnet, over the outer portions of the pole pieces by through bolts 32. These same bolts are utilized to secure a sheet of insulation 33 at the back ofthe magnet, carrying the terminals 34 of the coil and also to secure the casing about the magnet structure.

The latter features are particularly shown in Figures 2 and 3 where the casing is indicated as made upof an inclined back wall 35 having an attached substantially horizontal bottom wall 36 and a cooperating cap or cover section 37 hollowed to contain all the mechanism and having spaced wall sections 37, 38 at the back with open slots 39 at the lower ends to receive the bolts 32.

A convenient method of assembly is to first make up the electromagnetic structure in its entirety and to then place the same on the back of the casing with the ends of the bolts 32 projecting through the holes 40 in said back and to then slip the front or cap portion of the casing down over the magnet unit 11 with the back wall portions sliding between A. hook 42 turned inward and upward-fromthe metal taken out-of the cord passage 43 in the back wall engages over the. rearward wall portion 44 of the cover section to hold the upper portion of the cover firmly in place 6 o and the cap screws 41 rigidly secure the lower part of the cover section.

The nuts 45 on the bolts 32 which secure the-terminal base and fasten the pole pieces to the magnet, serve also as abutments, as shown in Figure 2, to hold the magnet structure spaced inwardly away from the case. The upper end of the sheet of insulation 33 is shown as folded down over the backs of thecoil terminals 34 to prevent accidental connection with the case.

. The arms 46 of the pole pieces embracing the upper end of the coil are shown as brought quite closely together over the intervening space in the arch of the magnet to provide a relatively narrow magnetic gap 47 and the reed is shown as having a cylindrical portion extending through the coil, terminating in a flattened end portion 48 having small clearmice at both sides of the gap. The lower end of the reed is shown as having a needle receiving socket49 and a clamp screw 50 for the needle received'in said socket, said screw projecting freely through an opening 51 provided 1n. the front wall of the case and the needle similarly projecting freely through an open- I ing 52 in the bottom wall of the case.

The lengths of the free portions of the reed, at opposite sides of the point where it is resiliently ripped, are proportioned to secure a desir made fully efiective at the gap end of the reed, The angular cross section of the resil iently held portion of the reed permits it to vibrate laterally and restrains axial twisting movements. In the construction illustrated,

- the pole pieces by reason of their U shape are each enabled to act on opposite ends of the reed, which very materially increases the sensible efiects in the coil.

The laminations of the pole pieces are shown as held together at their intermediate and tip portions by rivets 53 which aid in keeping these laminated structures of a uni form thickness so that they can be used as spacers to provide a seat between the clamp bars 29, 30 for the squared shank of the reed.

.The rubber sleeve about the shank, in addition to serving as aresilient pivot for the reed, acts as a compensating medium allowing L for a reasonable range of variations and inequalities in the size and fit of the parts, proa simple, sturdy mounting for the reed leverage ratio so that the lesser vibrations of the needle will be magnified or and enables the parts being quickly assembled without any great degree of care or skill.

The connection of the pick up device with the output of the radio set is conveniently effected by means of a plug illustrated at 54-. as adapted to be engaged with the detector socket of the receiver and having pins 55, 56 plugging into the output circuit of the detector and hence connecting the pick up directly with the input of the first audio-stage.

leaving four corner lugs 62. The terminals of the pick up cord 63 are inserted between certain of these lugs and the terminals of the volume control cord 64 are inserted between control which is indicated at 65 may simply be a suitable adjustable resistance device, as shown, connected in parallel across the pick-up.

The apparatus, it will be seen, can be quickly placed in service by simply substituting the pick-up device in place of the sound box of the phonograph and by plugging in the adapter into the detector socket-of the receiver. With the radio settnrned onand the phonograph started, the volume control may then be adjusted to give the desired volume of sound. The electromagnetic pick-up is sensitive and direct inits action and, aided by the amplifying power of the radio, reproduces the original sounds in their truevalues, free of distortion.

The same electromagnetic reproducing unit can be used with the vertically cut hill and dale type of record, as shown in Figures 7 and 8 by sim ly mounting the magnet unit yert1cally, as y means of a suitable supportmg bracket 66 and by providing thearma ture with a lateral extension 67 connected by a link 68 with the end of the stylus lever 69'pivoted' on a horizontal axis 70 to the floating weight 71.v The laterally extend- .ing arm 67 is shown as applied to the armaset, the audio-amplifier may be in the form' of a separate, simple audio-unit. The practical essentials of the apparatus will thus be seen to be relatively simple and inexpensive.

What is claimed is:

1. An electromagnetic reproducer comprising a permanent magnet, pole pieces applied thereto and having portions spaced to afford a seat therebetween, clamp bars bearing on opposite faces of said pole pieces and therebymaintained in definitely spaced relation by said pole pieces, said clamp bars closing opposite sides of the seat between connecting the same with a phonograph stylus, said reed having a base portion of substantially rectangular cross sectionand a. cylindrical stem terminating in a flattened blade, a coil surrounding said cylindrical portion of the reed, a permanent horseshoe magnet, pole pieces secured to said magnet and having opposed branches forming a magnetic gap for the flattened tip of the reed and opposed branches providing a seat for the substantially rectangular portion of the reed, an elastic sleeve about the angular portion of the reed, clamp bars closing opposite sides of the seat and securing said elastic sleeve in compressed relation with the inter- .vening portions of the pole pieces acting as spacers holding said clamp bars spaced in definite relation. 4

3. An electromagnetic reproducer comprising a permanent horse-shoe magnet, substantially U-shaped pole pieces secured to the legs of the magnet and having branches opposed in the arch portion of the magnet to form a ma etic gap and branches spaced at the ends 0 the magnet to provide a seat, a clamp bar overstanding said pole pieces and securing the same to the legs of the magnet, a second clamp bar disposed between the legs of the magnet, said clamp bars bridging the seat between the pole pieces; a magnetic reed adapted for actuation by a phonograph stylus, said-reed having a base portion of angular cross section disposed in said seat, a portion extending therefrom between the pole pieces and terminating in a blade operating inthe magnetic gap, an elastic mounting compressed in the seat about the base of the reed and a coil disposed between the opposing hollows of the substantially U-shaped pole pieces and surrounding the extending portion of the reed.

4. An electromagnetic reproducer comprising a permanent magnet, laminated pole pieces having separated portions providing a magnetic gap and other separated portions providing a seat, clamp members closing opposite sides of said seat with the laminations of the pole pieces hold'ing said members in definitely spaced relation, a magnetic reed having a shank portion disposed in said seat, a compressible mounting about said shank portionof the reed, said reed having means at one end for the connection therewith of a phonograph stylus and having its opposite end disposed in magnetic relation to the opposed pole pieces and a coil surrounding the intermediate portion of said reed.

5. An electromagnetic reproducer comprising a horse-shoe magnet, pole pieces applied to one face of said magnet, a clamp bar overstanding said pole pieces, screws extending through said clamp bar, the pole pieces and the legs of the magnet to secure said parts together, an insulating base secured by said screws at the opposite face of the magnet, a casing for the magnet secured to said screws at the back of said insulating base, a coil disposed between the legs of the magnet and having terminals on said insulating base and a magnetic reed extending through the coil and having a portion resiliently secured to the clamp bar and a portion in magnetic relation to the opposed pole pieces.

6. In an electromagnetic reproducer, a horse shoe magnet, pole pieces applied to one face of said. magnet, a clamp bar overstanding said pole pieces, screws extending through said clamp bar, the pole pieces and the legs of the magnet to secure said parts together, a casing for the magnet secured to said screws at theback of the magnet, a magnetic reed provided with a needle holder and with an armature portion in magnetic relation to the pole pieces, a bar for clamping said reed to the first clamp bar and screw means extending through the two clamp bars for securing said clamp bars together over the reed.

the face ofthe magnet, a magnetic reed positioned to cooperate with the'pole pieces and a clamp bar secured to the rst clamp bar with a portion of the magnetic reed between the two clamp bars and whereby the reed is de'linitelypositioned for coope 'ation with the pole pieces, said reed having an extension projecting away from the clamp bars and provided with a needle holder.

8. An electromagneticreproducer comprising a U-shaped magnet. pole pieces hearing against one face of said magnet, a clamp bar binding said pole pieces against the face of the magnet, a coil. resting on said clamp bar, a magnetic reed having a portion projecting from the clamp bar through the coil into magnetic relation to the pole pieces and a second clamp bar holding the reed gripped to the first clamp bar, said reed having an extension projecting from the clamp bars and provided with a needle holder.

9. An electromagnetic reproducer comprising a U-shaped magnet and an electromagnetic unit for attachment thereto, said unit consisting of pole pieces shapedto bear flat 7 against the face of the magnet, a clamp bar secured to the pole pieces and spaclng the same in definite relation, a coil mounted on the clamp bar, a magnetic reed having a portion extending through the coil and in elec tromagnetic relation to the pole pieces. a clamp construction for securing the reed to the clamp bar, said reed having a portion extending from the clamp bar and provided with a needle holder and screw means for attaching the unit as an entirety to the face of the magnet.

10. An electromagnetic reprodueer com prising a substantially U-shaped magnet having spaced arms, pole pieces overlying said arms, a clamp bar bridging the arms of the magnet and securing the pole pieces in engagement therewith, a coil mounted on the clamp bar, a magnetic reed having an armature portion at one end in cooperative rela tion to the pole pieces, a shank portion extending through the coil, a mounting portion at the bridge portion of the clamp bar and a needle holder portion at the opposite end and a clamp device for securing the mounting portion of the reed to the bridge portion of the clamp bar.

11. An electromagnetic reproducer comprising a horse shoe magnet, pole pieces applied to one face of said magnet, a clamp bar overstanding said pole pieces, an insulating base at the opposite face of said magnet, screws extending through said clamp bar, the pole pieces, the legs of themagnet and said insulating base to secure all of said parts together, a coil having terminals on said insulating base, a magnetic reed having a portion acted on by said coil and a portion in magnetic relation to theopposed pole pieces and means for securing said reed to the clamp bar.

12. In an electric reproducer unit, a magnet, an insulating base at the back of said magnet, pole pieces on the face of said magnet, a clamp bar overlying said pole pieces, a casing and screws extending through said clamp bar, pole pieces, magnet, insulating base and casing for securing all of said parts together.

13. An electric reproducer comprising a horseshoe magnet, pole pieces overlying the face of said magnet, an insulating base plate overlying the back of said magnet and extending across the space between the arms of the same, a coil between the pole pieces in front of said insulating base plate and having terminals on the insulating base, a magnetic reed supported in front of the magnet and the insulating base'plate and in operative relation to the coil and pole pieces, a flat back plate at the rear of said insulating base and having a forwardly angled bottom portion extending beneath the magnet and a hollow cover attached to the back wall extending forwardly over the magnet and down wardly to the forwardly angled bottom extension of the back wall. I

14. In an electro-magnetic reproducer, a substantially U-shaped magnet, pole pieces consisting of laminations bearing flat against one face of the magnet and having polar extensions projecting acrossthe space between the arms of the magnet, a clamp bar overlying said pole pieces and binding the laminated structure of the pole pieces against the face of the magnet, a coil between the clamp bar and the polar extensions of the pole pieces, a magnet reed having a portion extending through the coil into the region of the polar extensions, and means for securing the reed in supported relation to the clamp bar, said reed having an exposed stylus carrymg portion.

In testimony whereof I aflix my signature.

CARL F. GOU DY. 

